Derry is a town of approximately 34,000 people, located 10 miles southeast of Manchester New Hampshire and 38 miles north of Boston. The Derry Fire Department operates 4 engines, 1 Tower Ladder, 4 Ambulances, 1 Light Rescue, 1 Tanker and a Shift Commander, along with several support vehicles, special units, trailers and 1 spare engine operating out of 4 stations. The Tower Ladder is cross staffed, and the ambulances are rotated between Derry's 4 stations and have removable numbering for when they are reassigned.